We have recently seen the clever annotation of maps for the London Underground and the New York City subway system that indicate walking times between transit stations. Now, Paris transit planner Guillaume Martinetti has created a similar map using information from RATP and Google Maps walking predictor function. Based on this unofficial map, it appears possible to spend as little time as three minutes walking between some central Paris Metro stations. A great way to save on your travel budget, spend more time experiencing the city, and getting some exercise to boot.